Vehicular lamp

Abstract

The purpose of the present invention is to provide a vehicular lamp which creates light directed upward using a reflector that allows the light incident below the lower end of the lens to exit upward through a lens and which minimizes the uneven light distribution of the created light distribution pattern. The vehicular lamp according to the present invention includes: a semiconductor light source unit ( 20 ) including a light-emitting chip ( 21 ); a horizontally long lens ( 30 ) disposed in front of the light source unit ( 20 ); and a reflector ( 40 ) positioned between the lens ( 30 ) and light source unit ( 40 ) and disposed below the light-emitting chip ( 21 ) along a vertical direction. The reflector ( 40 ) includes a reflection surface ( 41 ) for creating a plurality of virtual focal points intersecting a vertical axis passing through the light emitting center O of the light-emitting chip ( 21 ). The distribution of light from the reflection surface ( 41 ) is controlled so that light is emitted from a light emitting surface ( 32 ) vertically below the optical axis Z of the lens ( 30 ). The lens ( 30 ) is formed such that, when a point light source is assumed on the optical axis Z, first direct light LM on the optical axis Z emitted from the point light source is distributed upward from the light emitting surface ( 32 ).

The invention claimed is: 
     
       1. A vehicular lamp, comprising;
 a semiconductor light source unit having a light emitting chip; 
 a lens disposed on a front side of the light source unit and is long in a horizontal direction; and 
 a reflector disposed at a position between the lens and the light source unit and on a lower side of the light emitting chip in a vertical direction, wherein 
 the reflector has a reflecting surface that forms a plurality of virtual focal points intersecting a vertical axis passing through a light emission center of the light emitting chip, 
 the reflecting surface performs light distribution control for radiating light from a light emission surface of the lens, lower than a lens optical axis, in the vertical direction, and 
 for first direct light on the lens optical axis from the light emitting chip arranged on the lens optical axis, the lens performs light distribution control of the first direct light to direct the first direct light upward above the lens optical axis from the light emission surface. 
 
     
     
       2. The vehicular lamp according to  claim 1 , wherein the lens is configured to perform light distribution control for radiating the first direct light on the light emission surface within a range in the vertical direction in which light reflected on the reflecting surface is to be radiated. 
     
     
       3. The vehicular lamp according to  claim 1 , wherein
 the light source unit includes the plurality of light emitting chips arranged in the horizontal direction, 
 the reflecting surface forms a plurality of virtual foci on the vertical axis of each of the light emitting chips, and 
 the plurality of the light emitting chips are arranged in the horizontal direction on a horizontal cross section including the optical axis of the lens, the lens performs light distribution control of a first direct light group on the horizontal cross section including the lens optical axis from the plurality of point light sources to direct the first direct light group upward above the lens optical axis from the light emission surface. 
 
     
     
       4. The vehicular lamp according to  claim 3 , wherein the lens is configured to perform light distribution control for radiating the first direct light group on the light emission surface within a range in the vertical direction in which light reflected on the reflecting surface is to be radiated. 
     
     
       5. The vehicular lamp according to  claim 1 , wherein the reflecting surface is formed on a surface on which free-form curves on which the virtual focal points are in succession in the horizontal direction on the vertical axis to form a virtual focal line. 
     
     
       6. The vehicular lamp according to  claim 1 , wherein
 micro diffusion elements that are raised strips that extend in the horizontal direction are formed in succession in the vertical direction on the incident surface, and the vertical cross section of the incident surface has asperities, and 
 the micro diffusion elements are formed so that a projecting height of the raised micro diffusion elements is reduced from the height position of the lens optical axis toward a lower end side of the lens in the vertical direction. 
 
     
     
       7. The vehicular lamp according to  claim 1 , wherein, on the vertical cross section including a straight line parallel to the lens optical axis passing through the light emission center of the light emitting chip, the reflector is located at a position lower than a straight line in the vertical direction connecting the lower end side in the vertical direction of the effective incident surface of the lens on which the direct light from the light emitting chip enters and the light emission center of the light emitting chip. 
     
     
       8. The vehicular lamp according to  claim 7 , wherein, at least a part of the reflector on the side of the lens is located at a position higher than, in the vertical direction, a straight line connecting a lower end side of the incident surface including a dummy surface of the lens and the light emission center of the light emitting chip.